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Commit ebb9d78b authored by Marco Zimmer's avatar Marco Zimmer
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+FactOrganizer: file & testet un-redo, Add

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
//TODO? PERF? (often inserts) SortedDict <-> Dict (often reads)
//TODO? hide base dict
//TODO: MMT: move some functionality there
//TODO: consequent!= samestep != dependent
//TODO! use URI as key
//PERF: avoid string as key (hash -> colission? -> strcmp[!])
public class FactOrganizer: Dictionary<int, Fact>
{
private Dictionary<int, meta> MetaInf = new Dictionary<int, meta>();
private List<stepnote> Workflow = new List<stepnote>();
// notes position in Workflow for un-/redo; the pointed to element is non-acitve
private int marker = 0;
// backlock logic for convinience
private int worksteps = 0;
private int backlog = 0;
// set if recently been resetted
private bool resetted = false;
private struct stepnote
{
// Fact.Id
public int Id;
// true if this Fact has been created in the same step as the last one
// steproot[false] (=> steptail[true])*
public bool samestep;
// reference to steproot/ after steptail-end
public int steplink;
// distincts creation and deletion
public bool creation;
public stepnote(int Id, bool samestep, bool creation, FactOrganizer that)
{
this.Id = Id;
this.samestep = samestep;
this.steplink = samestep ? that.Workflow[that.Workflow.Count - 1].steplink : that.Workflow.Count + 1;
this.creation = creation;
if (samestep)
// steplink = first steptail ? steproot : previous.steplink
{
stepnote prev = that.Workflow[that.Workflow.Count - 1];
this.steplink = prev.samestep ? prev.steplink : that.Workflow.Count - 1;
}
else
// steproot sets steplink after itself (end of steptail)
this.steplink = that.Workflow.Count + 1;
}
}
private struct meta
{
// TODO? -> last occurence for safe_dependencies
// reference to first occurrence in Workflow
public int workflow_id;
// keeps track wether Fact is currently in Scene
public bool active;
public meta(int workflow_id, bool active = true)
{
this.workflow_id = workflow_id;
this.active = active;
}
}
public FactOrganizer() : base() { }
public FactOrganizer(IDictionary<int, Fact> dictionary) : base(dictionary) { }
//TODO: PERF: better way than string search? -> use string as key!
public bool searchURI(string uri, out int found)
{
foreach(var element in this)
if (element.Value.backendURI.Equals(uri))
{
found = element.Key;
return true;
}
found = -1;
return false;
}
//TODO? MMT? PERF: O(n), every Fact-insertion
private bool FindEquivalent(Fact search, out Fact found)
// Looks for existent facts (found) which are very similar to prposed fact (search)
// does not check active state
{
foreach (var entry in this)
{
if (entry.Value.GetType() == search.GetType() &&
entry.Value.Equivalent(search))
{
found = entry.Value;
return true;
}
}
found = null;
return false;
}
private void WorkflowAdd(stepnote note)
// adds Workflow; updates meta struct; Invokes Events
{
if (note.samestep)
// update steplink of steproot
{
stepnote tmp = Workflow[note.steplink];
tmp.steplink = Workflow.Count + 1;
Workflow[note.steplink] = tmp;
}
Workflow.Add(note);
marker = Workflow.Count;
// update active info
meta info = MetaInf[note.Id];
info.active = note.creation;
MetaInf[note.Id] = info;
InvokeFactEvent(note.creation, note.Id);
}
public new void Add(int key, Fact value)
// hide
{
this.Add(value, out bool obsolete);
}
public int Add(Fact value, out bool exists, bool samestep = false)
// also checks for duplicates and active state
// returns key of actual Fact
{
if (resetted)
this.hardreset(false);
else if (backlog > 0)
{
worksteps -= backlog;
backlog = 0;
//TODO! incorporate deletion/ multiples in Workflow
for (int i = Workflow.Count - 1; i >= marker; i--)
{
stepnote last = Workflow[i];
this[last.Id].delete();
base.Remove(last.Id);
MetaInf.Remove(last.Id);
}
Workflow.RemoveRange(marker, Workflow.Count - marker);
}
if (!samestep)
worksteps++;
int key;
if (exists = FindEquivalent(value, out Fact found))
{
//TODO: MMT: del 'fact' (value) in MMT (alt.: s.TODO in addFact)
key = found.Id;
if (MetaInf[key].active)
return key;
}
else
{
//TODO: MMT: alt: insert in MMT if needed here/ on Invoke() (see WorkflowAdd)
key = value.Id;
base.Add(key, value);
MetaInf.Add(key, new meta(Workflow.Count, true));
}
WorkflowAdd(new stepnote(key, samestep, true, this));
return key;
}
public new bool Remove(int key)
// hide
{
return this.Remove(key, false);
}
public bool Remove(Fact value, bool samestep = false)
{
if (!this.ContainsKey(value.Id))
return false;
this.Remove(value.Id, samestep);
return true;
}
//TODO! test
public bool Remove(int key, bool samestep = false)
//no reset check (impossible)
{
if (!base.ContainsKey(key))
return false;
//TODO: see issue #58
safe_dependencies(key, out List<int> deletethis);
yeetusdeletus(deletethis, samestep);
return true;
}
// TODO: MMT: decide dependencies there
// TODO? handle deletions better
// TODO? decrease runtime from O(n/2)
private bool safe_dependencies(int key, out List<int> dependencies)
// searches for dependencies of a Fact; returns false if any dependencies are steproots
// int key: Fact to be deleted
// out List<int> dependencies: dependencyList
{
dependencies = new List<int>();
int c_unsafe = 0;
int pos = MetaInf[key].workflow_id;
dependencies.Add(key);
/* consequent!= samestep != dependent
// get steproot
if (Workflow[pos].samestep)
pos = Workflow[pos].steplink;
// add entire step
for (int i = pos; i < Workflow[pos].steplink; i++)
dependencies.Add(Workflow[i].Id);
pos = Workflow[pos].steplink;
*/
// accumulate facts that are dependent of dependencies
for (int i = pos; i < Workflow.Count; i++)
{
if (!Workflow[i].creation)
{
// just try
if (dependencies.Remove(Workflow[i].Id) && !Workflow[i].samestep)
c_unsafe--;
}
else if (0 < this[Workflow[i].Id].getDependentFactIds().Intersect(dependencies).Count())
{
dependencies.Add(Workflow[i].Id);
if (!Workflow[i].samestep)
c_unsafe++;
}
}
return c_unsafe == 0;
}
private void yeetusdeletus(List<int> deletereverse, bool samestep = false)
{
for(int i = deletereverse.Count - 1; i >= 0; i--, samestep = true)
{
WorkflowAdd(new stepnote(deletereverse[i], samestep, false, this));
}
}
private void reversestep(int pos, bool samestep = false)
// reverses any entire step; adds process to Workflow!
// int pos: position after steptail-end of the step to be reversed
{
pos--;
// check for valid step (implicit reset check)
if (pos >= marker)
return;
for (int i = pos, stop = Workflow[pos].samestep ? Workflow[pos].steplink : pos;
i >= stop; i--, samestep = true)
{
WorkflowAdd(new stepnote(Workflow[i].Id, samestep, !Workflow[i].creation, this));
}
}
public void undo()
{
if (resetted)
fastforward(); // revert softreset
else if (backlog < worksteps) {
backlog++;
stepnote last = Workflow[--marker];
int stop = last.samestep ? last.steplink : marker;
for (int i = marker; i >= stop; i--)
{
last = Workflow[i];
InvokeFactEvent(!last.creation, last.Id);
}
marker = stop;
}
}
public void redo()
{
resetted = false;
if (backlog > 0)
{
backlog--;
stepnote last = Workflow[marker];
int stop = last.samestep ? Workflow[last.steplink].steplink : last.steplink;
for (int i = marker; i < stop; i++)
{
last = Workflow[i];
InvokeFactEvent(last.creation, last.Id);
}
marker = stop;
}
}
public new void Clear()
// Does not Invoke RemoveFactEvent(s)!
{
base.Clear();
Workflow.Clear();
marker = 0;
worksteps = 0;
backlog = 0;
resetted = false;
}
public void hardreset(bool invoke_event = true)
{
foreach(var entry in this)
{
if (invoke_event) //TODO: check if removed?
CommunicationEvents.RemoveFactEvent.Invoke(entry.Value);
entry.Value.delete();
}
this.Clear();
}
public void softreset()
{
if (resetted)
{
fastforward();
return;
}
// TODO: PREF: alt: EventResetAll
// marker = 0; backlog = worksteps;
while (marker > 0)
undo();
resetted = true;
}
public void fastforward()
{
while (backlog > 0)
// also sets resetted = false;
redo();
}
public void store()
{
// TODO: save state of all of this?
}
public void load()
{
// TODO: see issue #58
}
private void InvokeFactEvent(bool creation, int Id)
{
if (creation)
CommunicationEvents.AddFactEvent.Invoke(this[Id]);
else
CommunicationEvents.RemoveFactEvent.Invoke(this[Id]);
}
}
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